Cane Creek 40 Series Top IS41

Cane Creek's 40-Series Top (IS41) brings proven headset tech from the premium 110-Series into a value-focused package. Precision-machined aluminum cups and sealed cartridge bearings deliver smooth steering and long life without the premium price tag.

The top assembly is engineered for integrated headsets with a 41mm upper cup ID and 28.6mm steerer interface (SHIS: IS41/28.6/H9 or H15). Available in both short (9mm) and tall (15mm) bearing covers, the 40-Series tops allow small stack adjustments and maintain consistent graphics and interchangeable parts across more than 40 configurations.

Materials & Bearings: The top uses lightweight, CNC-machined aluminum for strength-to-weight balance and aesthetic consistency. It ships with a sealed cartridge bearing to keep grit and water out for dependable performance on wet, muddy, and dusty trails.

Design benefits: low stack height (6mm specified stack), tight tolerances for minimal play, and easy swapping between H9 (9mm) and H15 (15mm) covers. Weight is featherlight — ~37g for the 9mm top and ~42g for the 15mm — making this an unobtrusive upgrade or replacement.

This top assembly is compatible with integrated head tube standards using an IS41 upper cup (41mm frame bore) and a 28.6mm (1-1/8") steerer. Confirm your frame’s SHIS spec — IS41/28.6 — before purchasing. The part number BAA0081K corresponds to the black finish variant sold at Forest Bikes.

Installation is straightforward with standard headset press tools: press the upper cup into the head tube, drop in the sealed cartridge bearing, then fit the appropriate cover (H9 or H15). Torque the top cap and stem per manufacturer specs to eliminate play without binding the steerer.

This top is aimed at mountain riders and builders who need a reliable, lightweight, and serviceable integrated headset component. It's ideal for riders maintaining a hardtail, trail, or cross-country frame that uses IS41 upper cups and a 1-1/8" steerer.

If you want a durable sealed bearing, consistent Cane Creek fitment across multiple frames, or an easy-to-swap top cover to fine-tune stack height, the 40-Series IS41 top assembly is a strong, cost-effective choice.

When selecting a headset top assembly, match the SHIS standard exactly: IS41 upper cup and 28.6mm steerer in this case. Decide whether you need the low-profile H9 or the taller H15 cover based on stem clamp height and spacer stack. Weight differences are minimal, so choose for fit and clearance.

Consider the riding conditions: sealed cartridge bearings (like Cane Creek’s 40-Series) are ideal for riders who want low maintenance and reliable performance across wet and muddy seasons. If you run a tapered steerer or non-integrated frame, look for the appropriate 40-Series variant instead.